A scholarship specifically for your boxing is unlikely. I think USA Boxing might do a few scholarships, but overall all that stopped when colleges stopped having their own boxing teams.
However, being involved in a sport/extracurricular activity like boxing and doing well in it will increase your standing of getting into a college as well as potential scholarships from the college based on the 'entire package' (your grades, ACT/SAT, app letter, and sports).
As long as your grades don't suffer from you hanging in the gym all day boxing can only help you. Good luck!